JP2002371197A - Conductive resin composition and method for manufacturing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a conductive resin composition capable of forming a molded body having high conductivity, excellent in shielding effect against electromagnetic waves, having high rigidity and good in surface properties, especially a conductive resin composition usable as casing of an electric instrument, especially suitable as a case of a personal computer. SOLUTION: The resin composition comprises a thermoplastic resin and carbon fibers. Based on 100 pts.wt. of the resin composition, contents of the carbon fibers is 10-50 pts.wt. In the carbon fibers, the contents of fibers having fiber length of <=50 μm is 3-12 pts.wt., and that having fiber length of >50 μm is 7-38 pts.wt.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a conductive resin composition which has high conductivity, is excellent in an electromagnetic wave shielding effect, has high rigidity, and can be formed into a molded product having good surface properties.
In particular, the present invention relates to a conductive resin composition that can be suitably used as a housing component of an electric device, especially a housing of a personal computer.

[0002]

2. Description of the Related Art A resin composition used as an electromagnetic wave shielding material for a personal computer housing or cover is required to have high conductivity in order to shield electromagnetic waves. To satisfy such requirements, a resin composition in which a conductive filler is dispersed in a matrix of a thermoplastic resin has been proposed.

[0003] Carbon fiber is generally used as a filler to be added to a thermoplastic resin because it has conductivity and also has an effect as a reinforcing agent. Molded articles made of a resin composition in which carbon fibers are blended with a thermoplastic resin have excellent rigidity and electrical conductivity, but in order to be used for shielding electromagnetic waves, they need to have higher and more stable electrical conductivity. For this purpose, it is necessary to mix a large amount of carbon fiber with a thermoplastic resin.

However, when a resin composition containing a large amount of carbon fibers is formed into a molded product as described above, there is a problem that the carbon fibers are oriented and warpage is increased, and the cost is increased.

To solve such problems, Japanese Patent Application Laid-Open No. 3-181532 discloses, for example, polyester resin, polyethylene resin, polypropylene resin, polyamide resin, acrylonitrile-butadiene-styrene copolymer (hereinafter referred to as "ABS"). ), A resin composition in which swollen graphite having a particle size of 20 µm or less is blended with a thermoplastic resin such as a polyacetal resin, a modified polyphenylene oxide resin, or a polycarbonate resin at a ratio of 5 to 30% by weight. Molded articles made of this resin composition,
Although the warpage is small, it is inferior to a molded article containing carbon fibers in terms of conductivity.

On the other hand, since the conductivity is greatly affected by the carbon fiber length, long fiber pellets in which the pellet size is equal to the carbon fiber length are also used. However, since all of the fibers are long fibers, the surface of the molded product is rough. There's a problem.

[0007]

DISCLOSURE OF THE INVENTION The present invention solves the above-mentioned problems and provides a conductive resin composition having high conductivity, excellent electromagnetic wave shielding properties, high rigidity, and a molded article having good surface properties. It provides things.

[0008]

Means for Solving the Problems The inventors of the present invention have conducted intensive studies to solve the above-mentioned problems. As a result, when the thermoplastic resin and the carbon fibers are melted and mixed by a kneading machine, two carbon fibers are mixed.
By supplying and mixing in more than one place, 50μ
m or less of fine carbon fibers,
As a result, they have found that a resin composition having high conductivity and being stable and having good surface properties can be obtained, and the present invention has been accomplished.

That is, according to the present invention, the ratio of the carbon fiber is 10 to 50 parts by weight based on 100 parts by weight of the resin composition containing the thermoplastic resin and the carbon fiber, and the carbon fiber has a fiber length of 10 to 50 parts by weight. 3 to 12 parts by weight of 50 μm or less;
The present invention relates to a conductive resin composition characterized in that the amount exceeding 0 μm is 7 to 38 parts by weight. Further, the present invention relates to a method for producing the conductive resin composition, wherein, when the thermoplastic resin and the carbon fiber are melt-mixed in a kneader, the carbon fiber is divided and supplied at two or more locations and mixed. Things.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION The conductive resin composition of the present invention has a carbon fiber ratio of 10 to 50 parts by weight based on 100 parts by weight of a resin composition containing a thermoplastic resin and carbon fibers. Of the carbon fibers, those having a fiber length of 50 μm or less are 3 to 12 parts by weight, and those having a fiber length of more than 50 μm are 7 to 38 parts by weight.

The ratio of carbon fibers in the resin composition is 10
If the amount is less than 10 parts by weight, the conductivity is not stably exhibited, and the rigidity of the molded article is inferior. If the compounding ratio exceeds 50 parts by weight, the carbon fibers are oriented and the warpage of the molded article increases. Therefore, the appearance is poor.

When the carbon fiber having a fiber length of 50 μm or less is less than 3 parts by weight, the surface of the molded article is roughened, resulting in poor appearance. If it exceeds 12 parts by weight,
Sufficient conductivity cannot be obtained. On the other hand, if the fiber length is more than 50 μm and less than 7 parts by weight, sufficient conductivity will not be obtained, and if it exceeds 38 parts by weight, the surface of the molded article will be rough and the appearance will be poor.

Examples of the thermoplastic resin as a main component of the conductive resin composition include polyamide resins such as nylon 6, nylon 66 and nylon 12, polyester resins such as polyethylene terephthalate and polybutylene terephthalate, polycarbonate resins, and polyarylate. Resin, vinyl chloride resin, polyethylene resin, chlorinated polyethylene resin, chlorinated polypropylene resin, polypropylene resin, polystyrene resin, acrylonitrile / styrene resin, ABS resin, vinylidene chloride resin, vinyl acetate resin, thermoplastic polyimide resin, butadiene resin, Polyacetal resin, ionomer resin, ethylene-vinyl chloride copolymer resin, ethylene-vinyl acetate copolymer resin, polyphenylene oxide resin, modified polyphenylene oxide resin, Risaruhon resin, acrylic resin,
Examples thereof include a methacrylic resin, a phenoxy resin, a polyvinyl formal resin, and a polyvinyl butyral resin, and a mixture of two or more of these resins. Among them, a polyamide resin, a polyester resin, a polycarbonate resin, a polycarbonate ABS resin (ABS resin blended with polycarbonate) and a polyarylate resin are preferable, and a polyamide resin is particularly preferable in that it has a good affinity for carbon fibers.

Examples of the polyamide resin include homopolyamides and copolyamides obtained by polymerizing monomers such as lactams, aminocarboxylic acids and / or diamines and dicarboxylic acids, and mixtures thereof. That is, polycaproamide (nylon 6), polyhexamethylene adipamide (nylon 66), polytetramethylene adipamide (nylon 46), polyhexamethylene sebacamide (nylon 610), polyhexamethylene dodecamide (nylon) 612), polyundecamethylene adipamide (nylon 116), polybis (4-aminocyclohexyl) methandodecamide (nylon PACM1)
2), polybis (3-methyl-4aminocyclohexyl) methandodecamide (nylon dimethyl PACM1)
2), polynonamethylene terephthalamide (nylon 9
T), polyundecamethylene terephthalamide (nylon 11T), polyundecamethylene hexahydroterephthalamide (nylon 11T (H)), polyundecamide (nylon 11), polydodecamide (nylon 1
2), polytrimethylhexamethylene terephthalamide (nylon TMDT), polyhexamethylene terephthalamide (nylon 6T), polyhexamethylene isophthalamide (nylon 6I), polymethaxylylene adipamide (nylon MXD6) and copolymers thereof , Mixtures and the like, among which nylon 6, nylon 66,
These copolymerized polyamides and mixed polyamides are particularly preferred.

In the present invention, when an amorphous polyamide is blended with the above-mentioned crystalline polyamide resin, a resin composition having excellent appearance can be obtained. Examples of the amorphous polyamide resin include a polycondensate of isophthalic acid / terephthalic acid / hexamethylenediamine / bis (3-methyl-4-aminocyclohexyl) methane, terephthalic acid / 2,
2,4-trimethylhexamethylenediamine / 2,4
A polycondensate of 4-trimethylhexamethylenediamine, a polycondensate of isophthalic acid / bis (3-methyl-4-aminocyclohexyl) methane / ω-laurolactam, a polycondensate of isophthalic acid / terephthalic acid / hexamethylenediamine, Polycondensate of isophthalic acid / 2,2,4-trimethylhexamethylenediamine / 2,4,4-trimethylhexamethylenediamine, isophthalic acid / terephthalic acid /
2,2,4-trimethylhexamethylenediamine / 2,
A polycondensate of 4,4-trimethylhexamethylenediamine, a polycondensate of isophthalic acid / bis (3-methyl-4-aminocyclohexyl) methane / ω-laurolactam, and the like can be given. Further, those in which the benzene ring of the terephthalic acid component and / or the isophthalic acid component constituting these polycondensates is substituted with an alkyl group or a halogen atom are also included. Furthermore, two or more of these amorphous polyamides can be used in combination. Preferably, a polycondensate of isophthalic acid / terephthalic acid / hexamethylenediamine / bis (3-methyl-4-aminocyclohexyl) methane or terephthalic acid / 2,2,4-trimethylhexamethylenediamine / 2,4,4 A polycondensate of trimethylhexamethylenediamine or a polycondensate of isophthalic acid / terephthalic acid / hexamethylenediamine / bis (3-methyl-4-aminocyclohexyl) methane and terephthalic acid /
2,2,4-trimethylhexamethylenediamine / 2,
A mixture with a polycondensate of 4,4-trimethylhexamethylenediamine is used.

Considering the relaxation of the crystallinity of the polyamide resin, the heat of fusion of the amorphous polyamide resin is 1 cal when measured at a heating rate of 16 ° C./min in a nitrogen atmosphere using a differential scanning calorimeter. / G or less.

The mixing ratio of the crystalline polyamide and the amorphous polyamide is not particularly limited, but (crystalline polyamide) / (amorphous polyamide) = 50 / 50-98.
/ 2 (weight ratio). If the amount of the amorphous polyamide is less than 2% by weight, the surface smoothness, that is, the glossiness tends to be lost when the carbon fiber is blended at a high concentration. When carbon fibers are blended with amorphous polyamides, amorphous polyamides generally have high melt viscosities, so a smooth surface cannot be obtained unless molded with a high-temperature mold. The molding cycle is extended and productivity is deteriorated.

Although the relative viscosity of the polyamide resin used in the present invention is not particularly limited, the relative viscosity measured at a temperature of 25 ° C. and a concentration of 1 g / dl using 96% by weight concentrated sulfuric acid as a solvent is 1. It is preferably in the range of 4 to 4.0. If the relative viscosity is smaller than 1.4, the viscosity is low,
It becomes difficult to take off after melt-kneading, and it becomes difficult to obtain desired physical properties in the composition. On the other hand, if it is larger than 4.0, the fluidity during molding is poor due to high viscosity, and a sufficient injection pressure is not applied, so that it is difficult to produce a molded product.

In the present invention, examples of the carbon fiber that plays the role of a conductive agent and a reinforcing agent include polyacrylonitrile (PAN) and pitch carbon fibers having high strength and high electrical conductivity. As the PAN-based carbon fiber, specifically, Vesfight chopped fiber and Vesfight milled fiber manufactured by Toho Rayon Co., Ltd., Torayca chopped fiber and Torayca milled fiber manufactured by Toray Co., Ltd. Fort
afil Fiber's Fortafil, Nippon Polymer Sangyo Co., Ltd. CFPA series, and the like. Specific examples of the pitch-based carbon fiber include donacarb chopped fiber and donacarb milled fiber, Kureha Chemical Co., Ltd. manufactured by Osaka Gas Co., Ltd. Creka
Chopped fiber and Creca milled fiber are examples.

The carbon fiber has a fiber length of 0.1 to 7 before kneading.
mm, and particularly preferably 1 to 6 mm. Further, the fiber diameter is preferably in the range of 5 to 15 μm.

The conductive resin composition having the above composition contains a bromine flame retardant or a red phosphorus flame retardant in an amount of 50 parts by weight or less, preferably 2 parts by weight, per 100 parts by weight of the resin composition.
A ratio of 0 to 40 parts by weight is preferable because flame retardancy can be further improved in addition to the above-mentioned characteristics. Mixing ratio is 50
If the amount exceeds the weight part, the mechanical strength of the molded article tends to be impaired.

The bromine-based flame retardant used in the present invention preferably has a bromine content of 50 to 90% by weight. When the bromine content is less than 50% by weight, the flame retardant effect is poor and a large amount of a flame retardant needs to be added, and the mechanical strength is impaired. On the other hand, when the bromine content exceeds 90% by weight, the effect of the present invention cannot be sufficiently exerted because bromine is easily released during molding. Specifically, for example, brominated polystyrene, brominated cross-linked aromatic polymer, brominated styrene / maleic anhydride copolymer, brominated polyphenylene ether, brominated epoxy resin, brominated phenoxy resin, etc. Particularly, brominated polystyrene can be suitably used.

Examples of the brominated polystyrene used herein include those obtained by adding bromine to polystyrene, those obtained by polymerizing a styrene monomer to which bromine is added, or a mixture of both of them. Particularly, brominated polystyrene is used. Great Lakes PDBS, which is obtained by polymerizing a styrene monomer, and Pyro Check 68PB, which is obtained by adding bromine to polystyrene, are preferable in terms of color tone, fluidity and heat resistance.

As the red phosphorus-based flame retardant, allotrope species of various colors (red, purple or black phosphorus) sold under the name of red phosphorus can be used. The shape of the red phosphorus when blended in the thermoplastic resin is not particularly limited, but in consideration of the dispersibility in the resin composition, generally a finely divided form,
For example, it is desirable to use red phosphorus in the form of particles divided into particle diameters of 200 μm or less, preferably in the form of particles having an average particle diameter in the range of 1 to 100 μm.

Although red phosphorus may be used alone, it is preferable to use a red phosphorus particle whose surface is coated with a polymer film or an inorganic coating material to improve heat resistance. Examples of the polymer that coats the surface of the red phosphorus particles include an epoxy resin, a polymer having maleic acid, fumaric acid, or an allyl unsaturated bond, or a polymer having a melting point of 50 to 90 ° C and 10,000.
Unsaturated polyesters having the following molecular weights, novolak-type thermoplastic phenol-formaldehyde polycondensation products, and thermoplastic phenol-isobutyraldehyde polycondensation products include, among others, thermoplastic phenol-isobutyraldehyde polycondensation products. It can be suitably used. The blending amount of these polymers is not particularly limited, but is at most 90% by weight based on the total weight of the mixture of red phosphorus and the coating polymer, and is generally 2 to 50%.
% By weight.

The resin composition of the present invention may contain a flame retardant aid in addition to the above-mentioned flame retardant in order to sufficiently bring out the effect of the flame retardant. Examples of the flame retardant aid used together with the bromine flame retardant include antimony trioxide, sodium antimonate, tin (IV) oxide, iron (III) oxide, zinc oxide, zinc borate, and the like. Examples of the flame retardant auxiliary used together with the above include melamine polyphosphate, melamine cyanurate, magnesium hydroxide and the like. In the case of a brominated flame retardant in terms of weight ratio, the blending ratio of the flame retardant auxiliary to the flame retardant is as follows: flame retardant: flame retardant = 5: 1 to 1:
1. In the case of red phosphorus, it is preferable that the ratio of flame retardant: flame retardant aid = 1: 2-1: 7.

The conductive resin composition of the present invention may further comprise a releasing agent, a heat stabilizer, an antioxidant, a light stabilizer, a lubricant, a pigment, a plasticizer, a cross-linking agent, Various additives such as impact modifiers, inorganic substances, and dyes, and carbon-based and metal-based conductive assistants may be added. These are added when the resin composition is melt-kneaded or melt-molded.

The conductive resin composition of the present invention is produced by melt-kneading using a kneader with a thermoplastic resin, carbon fiber, and, if necessary, a flame retardant and various additives, and pelletizing. However, at that time, the carbon fiber can be manufactured by dividing and supplying the carbon fiber to two or more places and mixing. For example, a thermoplastic resin and carbon fiber 3
~ 12 parts by weight from the beginning of the kneading machine, carbon fiber 7 ~
It is manufactured by supplying and mixing 38 parts by weight from the middle of the kneader.

When carbon fibers are supplied from one place,
If the compounding amount is small, the conductivity is not sufficient, and if the compounding amount is large, the carbon fibers are oriented and warpage increases, and the surface property deteriorates. On the other hand, as in the present invention, by supplying carbon fibers in two or more places, the first supplied carbon fibers are kneaded at the time of kneading because they are strongly kneaded in the shear melting zone of the resin. It becomes fine fibers of 50 μm or less, and the carbon fibers supplied later do not pass through the kneading zone, and thus maintain a length exceeding 50 μm.
As a result, a resin composition having high conductivity and good surface properties can be obtained. In order to obtain a molded article from the resin composition thus obtained, the resin composition may be injection-molded using an injection molding machine or press-molded using a press molding machine.

The molded article made of the conductive resin composition constituted as described above should be a molded article having a high conductivity, an excellent electromagnetic wave shielding effect, a high rigidity, a small variation in physical properties and a good surface property. Fuel-based parts and electricity and
It can be suitably used as a housing of an electronic component or an electric device, for example, a housing or cover of a personal computer, a mechanical bearing, a mechanical packing sealant, a fue tube, a fue connector, a device of a clean room, a printer, or a copier.

[0031]

Next, the present invention will be described in detail with reference to examples, but the present invention is not limited to these examples. In addition, the measurement of various physical property values in the following Examples and Comparative Examples was performed by the following methods.

[Measurement of Fiber Length Distribution of Carbon Fiber] A pellet of a thermoplastic resin containing carbon fiber is dissolved in sulfuric acid having a concentration of 96% or more, the carbon fiber is taken from this solution, and an enlarged photograph is taken with a microscope. The fiber length of the carbon fiber in the photograph was measured, and the weight fraction of 50 μm or less and more than 50 μm was calculated from the fiber length distribution.

[Conductivity] A metal terminal is heated and press-fitted into an ASTM No. 1 piece formed by injection molding using Nestal SG75 (Sumitomo Heavy Industries, Ltd.) at intervals of 150 mm as shown in FIG. 2 using a commercially available soldering iron. Was embedded, and the resistance between the terminals was measured with a HIOKI MODEL3010 tester.

[Tensile strength] According to ASTM D638, the tensile strength was measured using an ASTM No. 1 piece molded by injection molding using Nestal SG75 manufactured by Sumitomo Heavy Industries, Ltd.

[Surface properties] In accordance with JIS B0601, Sumitomo Heavy Industries Co., Ltd. Nestal SG75 is used to form an ASTM No. 1 piece by injection molding.
Centerline parallel roughness (Ra) was measured using Handy Surf E-30A.

Example 1 Polyamide A (UBE nylon 1011FB manufactured by Ube Industries)
70 wt% and 10 wt% of carbon fiber (Nippon Polymer Sangyo Co., Ltd. CFPA-LC3) are charged from an extruder (Toshiba Machine Co., Ltd., Tem35B) having the screw configuration of FIG. 1 and the resin is in a molten state (resin temperature 280 ° C.). In this place, 20 wt% of carbon fiber (Nippon Polymer Sangyo Co., Ltd. CFPA-LC3) was additionally charged from FIG. 1, kneaded and pelletized, and the distribution length of carbon fiber was measured. Further, using the obtained pellets, the ASTM No. 1 piece was subjected to Sumitomo Heavy Industries, Ltd.
Injection molding was performed at a mold temperature of 80 ° C. and the conductivity, tensile strength, and surface properties were measured. Table 1 shows the obtained results.

Comparative Example 1 Polyamide A (UBE Nylon 1011FB manufactured by Ube Industries)
70 wt% was supplied from an extruder (Toshiba Machine Co., Ltd., Tem35B) having the screw configuration shown in FIG. 1 and the resin was in a molten state (resin temperature 280 ° C.). Sangyo Co., Ltd. CFPA
-LC3) was added so as to be 30 wt%, kneaded and pelletized, and the distribution length of carbon fibers was measured. Using the obtained pellets, ASTM No. 1 pieces were injection-molded at a resin temperature of 280 ° C. and a mold temperature of 80 ° C. using Nestal SG75 (Sumitomo Heavy Industries, Ltd.), and the conductivity, tensile strength and surface properties were measured. Table 1 shows the obtained results.

Comparative Example 2 Polyamide A (UBE Nylon 1011FB manufactured by Ube Industries)
80 wt% was supplied from an extruder (Tem35B, Toshiba Machine Co., Ltd.) having the screw configuration shown in FIG. 1 and the resin was in a molten state (resin temperature 280 ° C.). Sangyo Co., Ltd. CFPA
-LC3) was added so as to be 20 wt%, kneaded and pelletized, and the distribution length of carbon fibers was measured. Using the obtained pellets, ASTM No. 1 pieces were injection-molded at a resin temperature of 280 ° C. and a mold temperature of 80 ° C. using Nestal SG75 (Sumitomo Heavy Industries, Ltd.), and the conductivity, tensile strength and surface properties were measured. Table 1 shows the obtained results.

Example 2 Polyamide B (UBE nylon 1015B manufactured by Ube Industries) 7
5 wt% and AES resin (Ube Sycon Corp. WX
270) 10 wt% and carbon fiber (Fortafil Fiber In
c. Fortafil243) 5 wt% is fed from an extruder (Toshiba Machine Co., Ltd., Tem35B) having the screw configuration of FIG. 1 and the carbon fiber of FIG. 1 is placed where the resin is in a molten state (resin temperature 280 ° C.). (Fortafil Fiber Inc. Fo
rtafil243) 10 wt% was additionally charged, kneaded and pelletized, and the distribution length of carbon fibers was measured. Further, using the obtained pellets, ASTM No. 1 piece was subjected to a resin temperature of 280 ° C. and a mold temperature of 80 ° C. by Nestal SG75, Sumitomo Heavy Industries, Ltd.
And the conductivity, tensile strength, and surface properties were measured. Table 1 shows the obtained results.

Comparative Example 3 Polyamide B (UBE nylon 1015B manufactured by Ube Industries) 8
0 wt% and AES resin (Ube Sycon Corp. WX
270) 10 wt% is supplied from an extruder (Tem35B, Toshiba Machine Co., Ltd.) having the screw configuration shown in FIG. 1 and the resin is in a molten state (resin temperature 280 ° C.). Fortafil Fiber Inc. Fort
afil243) was added at 10 wt%, kneaded and pelletized, and the distribution length of carbon fibers was measured. Using the obtained pellets, ASTM No. 1 pieces were injection-molded at a resin temperature of 280 ° C. and a mold temperature of 80 ° C. using Nestal SG75 (Sumitomo Heavy Industries, Ltd.), and the conductivity, tensile strength and surface properties were measured. Table 1 shows the obtained results.

Comparative Example 4 Polyamide B (UBE Nylon 1015B manufactured by Ube Industries) 8
0 wt% and AES resin (Ube Sycon Corp. WX
270) 10 wt% and carbon fiber (FortafilFiber In
c. Fortafil243) 10 wt% from an extruder (Toshiba Machine Co., Ltd., Tem35B) having the screw configuration of FIG. 1 is melted and kneaded so that the resin temperature becomes 280 ° C.
Pellets were formed and the distribution length of carbon fibers was measured. Using the obtained pellets, ASTM No. 1 pieces were injection-molded at a resin temperature of 280 ° C. and a mold temperature of 80 ° C. using Nestal SG75 (Sumitomo Heavy Industries, Ltd.), and the conductivity, tensile strength and surface properties were measured. Table 1 shows the obtained results.

[0042]

[Table 1]

[0043]

According to the present invention, by blending a thermoplastic resin with carbon fibers having a wide fiber length distribution at a predetermined ratio, it is possible to obtain conductivity enough to be used for shielding electromagnetic waves, A resin composition having high rigidity and good surface properties can be obtained. Therefore, it is possible to provide a conductive resin composition which can be suitably used as an electromagnetic wave shield requiring conductivity and rigidity, and which can be suitably used as a housing or cover of an electric device, particularly a personal computer.

[Brief description of the drawings]

FIG. 1 is a diagram showing an outline of an operation of kneading a thermoplastic resin and carbon fibers by a kneader.

FIG. 2 is a schematic view showing a method for measuring conductivity.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) C08L 77/00 C08L 77/00 H01B 1/00 H01B 1/00 K 1/24 1/24 Z 13/00 501 13/00 501P F-term (reference) 4F070 AA54 AC04 AD02 AE06 FA03 FB06 FB07 FC05 4F071 AA02 AA54 AB03 AD01 AD06 AE15 AF14 AF37 AH16 BA01 BB05 BC07 4J002 AA011 BB021 BB051 BB011 BB1111 BB1111 BB1111 CB001 CF061 CF071 CF161 CG001 CH071 CH081 CL001 CL011 CL021 CL031 CL051 CM041 CN031 DA016 FA046 FD016 FD116 FD130 GQ02 5G301 DA20 DA51 DD06

Claims (5)

[Claims] The present invention relates to a resin composition containing a thermoplastic resin and carbon fibers.
0 parts by weight, and the carbon fiber has a fiber length of 50 μm.
m or less, 3 to 12 parts by weight;
A conductive resin composition characterized in that the amount is from 38 to 38 parts by weight. 2. The conductive resin composition according to claim 1, wherein the thermoplastic resin is a polyamide resin. 3. The conductive resin composition according to claim 1, wherein, when the thermoplastic resin and the carbon fiber are melt-mixed by a kneader, the carbon fiber is supplied by being divided into two or more places and mixed. Method of manufacturing a product. 4. When the thermoplastic resin and carbon fiber are melted and mixed by a kneading machine, 3 to 12 parts by weight of the thermoplastic resin and carbon fiber are supplied from the head of the kneading machine, and 7 to 38 parts by weight of carbon fiber are kneaded. The method for producing a conductive resin composition according to claim 1, wherein the mixture is supplied from the middle of the machine and mixed. 5. A molded product obtained by molding the conductive resin composition according to claim 1 or 2.